/*
* Copyright 2007 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

using System;
using System.Text.RegularExpressions;

namespace ZXing.Client.Result
{
   /// <summary>
   /// Represents a result that encodes an e-mail address, either as a plain address
   /// like "joe@example.org" or a mailto: URL like "mailto:joe@example.org".
   /// </summary>
   /// <author>Sean Owen</author>
   internal sealed class EmailAddressResultParser : ResultParser
   {
      private static readonly Regex COMMA = new Regex(","
#if !(SILVERLIGHT4 || SILVERLIGHT5 || NETFX_CORE || PORTABLE)
                                             , RegexOptions.Compiled);
#else
);
#endif

      public override ParsedResult parse(ZXing.Result result)
      {
         String rawText = result.Text;
         if (rawText == null)
         {
            return null;
         }

         if (rawText.ToLower().StartsWith("mailto:"))
         {
            // If it starts with mailto:, assume it is definitely trying to be an email address
            String hostEmail = rawText.Substring(7);
            int queryStart = hostEmail.IndexOf('?');
            if (queryStart >= 0)
            {
               hostEmail = hostEmail.Substring(0, queryStart);
            }
            hostEmail = urlDecode(hostEmail);
            String[] tos = null;
            if (!String.IsNullOrEmpty(hostEmail))
            {
               tos = COMMA.Split(hostEmail);
            }
            var nameValues = parseNameValuePairs(rawText);
            String[] ccs = null;
            String[] bccs = null;
            String subject = null;
            String body = null;
            if (nameValues != null)
            {
               if (tos == null)
               {
                  String tosString;
                  if (nameValues.TryGetValue("to", out tosString) && tosString != null)
                  {
                     tos = COMMA.Split(tosString);
                  }
               }
               String ccString;
               if (nameValues.TryGetValue("cc", out ccString) && ccString != null)
               {
                  ccs = COMMA.Split(ccString);
               }
               String bccString;
               if (nameValues.TryGetValue("bcc", out bccString) && bccString != null)
               {
                  bccs = COMMA.Split(bccString);
               }
               nameValues.TryGetValue("subject", out subject);
               nameValues.TryGetValue("body", out body);
            }
            return new EmailAddressParsedResult(tos, ccs, bccs, subject, body);
         }
         if (!EmailDoCoMoResultParser.isBasicallyValidEmailAddress(rawText))
         {
            return null;
         }
         return new EmailAddressParsedResult(rawText);
      }
   }
}